Control morphology of nanostructures with electric field

Jonghyun Park; Wei Lu
August 2009
Applied Physics Letters;8/17/2009, Vol. 95 Issue 7, p073110
Academic Journal
We showed that the morphology of nanostructures on a dielectric substrate may be tuned by electric field. The collective action of surface energy, interface energy between nanostructures and the substrate, and electrostatic energy defines a thermodynamic force that drives surface diffusion. The evolution is characterized by a quick adjustment of the dihedral angle at the triple junction, followed by an extrusion of a thin layer from the edges, and subsequent significant overall morphology change through long range mass transport. A high voltage can induce instability of the extrusion, causing the formation of a pattern of tiny islands.


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